Plant Pathology - Study Mode

[#221] Root growth is particularly affected by
Correct Answer

(C) P

Explanation

Solution: Root growth is particularly affected by P. Phosphorus is also associated with complex energy transformations in the plant. Adding phosphorus to soil low in available phosphorus promotes root growth and winter hardiness, stimulates tillering, and often hastens maturity.

[#222] In rust cycle the cereal host is infected by
Correct Answer

(B) Aeciospores

Explanation

Solution: In the rust cycle, the cereal host is infected by Aeciospores. Aeciospores are one of several different types of spores formed by Rusts. They each have two nuclei and are typically seen in chain-like formations in the aecium. Aeciospores are dispersal structures and heteroecious rusts need to land on the primary host.

[#223] The chemical composition of basic slag is
Correct Answer

(B) (CaO) 3 P 2 O 5 , SiO 2

Explanation

Solution: The chemical composition of basic slag is (CaO) 3 P 2 O 5 , SiO 2 . Slag is a by-product of smelting (pyrometallurgical) ores and used metals. Basic slag systems are made up primarily of limestone, particularly calcium carbonate (CaCO 3 ), which helps provide good impact properties at low temperatures. Basic slag is low in silica and high in base-forming oxides that are used in the basic process of steelmaking and that are subsequently useful as a fertilizer.

[#224] In case of C 4 -pathway
Correct Answer

(B) CO 2 combines with PEP

Explanation

Solution: In the case of the C 4 -pathway, CO 2 combines with PEP. The CO 2 combines with ribulose bisphosphate and goes through the Calvin cycle while the pyruvate re-enters the mesophyll cells, reacts with ATP, and is converted back to phosphoenolpyruvate, the starting compound of the C 4 cycle. PEP carboxylase attaches an incoming carbon dioxide molecule to the three-carbon molecule PEP, producing oxaloacetate.

[#225] Element essential for photolyisis of water is
Correct Answer

(C) Carbon

Explanation

Solution: An element essential for the photolyisis of water is Carbon. Photolysis is the chemical process by which molecules are broken down into smaller units through the absorption of light. In this process of photolysis, H 2 O molecules are broken into hydrogen ions, electrons, and oxygen atoms. Other mineral ions required for the photolysis of water are manganese, calcium and chlorine.